Document & pylint fixes for util.py
Document & pylint fixes for util.py

Signed-off-by: Raul Gutierrez S <f25f6873bbbde69f1fe653b3e6bd40d543b8d0e0@itevenworks.net>

harlowja/zk_shell,rgs1/zk_shell,harlowja/zk_shell,rgs1/zk_shell